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Posted to batik-dev@xmlgraphics.apache.org by "Bjoern Voigt (JIRA)" <ji...@apache.org> on 2018/10/31 13:46:00 UTC
[jira] [Commented] (BATIK-1191) Batik changed the overflow default
for drawings
[ https://issues.apache.org/jira/browse/BATIK-1191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16670123#comment-16670123 ]
Bjoern Voigt commented on BATIK-1191:
-------------------------------------
The sample shows, that Batik introduced the default "overflow: hidden" for the svg root element. This is probably consistent with the SVG specification:
{quote}_The following paragraph is informative._
Note that no clipping of overflow is performed, but that such clipping will take place if the content is viewed in an [SVG user agent|https://www.w3.org/TR/2008/PR-SVGTiny12-20081117/single-page.html#intro-TermSVGUserAgent] that supports clipping (e.g. a user agent that supports [SVG 1.1 Full|http://www.w3.org/TR/SVG11/] [[SVG11|https://www.w3.org/TR/2008/PR-SVGTiny12-20081117/single-page.html#refs-ref-SVG11]]), since the initial value for the ['overflow'|http://www.w3.org/TR/2003/REC-SVG11-20030114/masking.html#OverflowProperty] property is hidden for elements that establish [viewports|https://www.w3.org/TR/2008/PR-SVGTiny12-20081117/single-page.html#intro-TermViewport] ([[SVG11|https://www.w3.org/TR/2008/PR-SVGTiny12-20081117/single-page.html#refs-ref-SVG11]], section 14.3.3). Content authors that want content to be fully forward compatible are advised to either specify the ['overflow'|http://www.w3.org/TR/2003/REC-SVG11-20030114/masking.html#OverflowProperty] property or to make sure that content that shouldn't be clipped is inside of the established viewport.
[Scalable Vector Graphics (SVG) Tiny 1.2 Specification - Establishing a new viewport |https://www.w3.org/TR/2008/PR-SVGTiny12-20081117/single-page.html#coords-EstablishingANewViewport]
{quote}
> Batik changed the overflow default for drawings
> -----------------------------------------------
>
> Key: BATIK-1191
> URL: https://issues.apache.org/jira/browse/BATIK-1191
> Project: Batik
> Issue Type: Bug
> Components: SVG Viewer
> Affects Versions: 1.9
> Reporter: Bjoern Voigt
> Priority: Major
> Attachments: initial-view-left18_right19.png, sample.svg, wider-window-view-left18_right19.png
>
>
> If an SVG image contains objects partially or completely outside the viewbox, then these objects are completely or partially hidden, even if the view is changed manually with zoom & pan.
> This bug is introduced in revision r1784917:
> {code:java}
> $ svn log -c r1784917
> ------------------------------------------------------------------------
> r1784917 | ssteiner | 2017-03-01 12:44:53 +0100 (Wed, 01 Mar 2017) | 1 line
> BATIK-1179: Clip wrongly applied
> ------------------------------------------------------------------------
> {code}
> The revision r1784917 introduced a global CSS stylesheet:
> {code:java}
> $ svn diff -c r1784917
> Index: batik-svg-dom/src/main/resources/org/apache/batik/dom/svg/resources/UserAgentStyleSheet.css
> ===================================================================
> --- batik-svg-dom/src/main/resources/org/apache/batik/dom/svg/resources/UserAgentStyleSheet.css (revision 1784916)
> +++ batik-svg-dom/src/main/resources/org/apache/batik/dom/svg/resources/UserAgentStyleSheet.css (nonexistent)
> @@ -1,6 +0,0 @@
> -/*
> - * The default SVG style sheet.
> - */
> -svg, symbol, image, marker, pattern, foreignObject { overflow: hidden }
> -
> -/* svg { width:attr(width); height:attr(height) } */
> Index: batik-anim/src/main/resources/org/apache/batik/anim/dom/resources/UserAgentStyleSheet.css
> ===================================================================
> --- batik-anim/src/main/resources/org/apache/batik/anim/dom/resources/UserAgentStyleSheet.css (nonexistent)
> +++ batik-anim/src/main/resources/org/apache/batik/anim/dom/resources/UserAgentStyleSheet.css (revision 1784917)
> @@ -0,0 +1,6 @@
> +/*
> + * The default SVG style sheet.
> + */
> +svg, symbol, image, marker, pattern, foreignObject { overflow: hidden }
> +
> +/* svg { width:attr(width); height:attr(height) } */{code}
> The issue can be easily shown with the attached sample.svg and Squiggle (part of the Batik SVG distribution). It is not a bug of Squiggle. Sample programs with JSVGCanvas show the same behavior.
> java -jar batik-squiggle-1.8.jar sample.svg
> java -jar batik-squiggle-1.9.jar sample.svg
> Initially both Squiggle windows look similar. But if you make the Squiggle windows wider, then the version 1.8 variant of Squiggle shows the complete red rectangle, which is partially outside the viewbox. The version 1.9 variant keeps the red rectangle cut off on the viewbox.
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